What is Aluminium Hydroxide?

Aluminium hydroxide or also known as aluminic acid, aluminic hydroxide, or hydrated alumina is a chemical compound with the formula of Al(OH)3. Aluminium hydroxide is a stable odorless and white crystalline powder at standard conditions and insoluble in water.

Aluminium hydroxide is found in nature in the form of minerals such as gibbsite, bayerite, doyleite, or nordstrandite. Due to aluminium hydroxide’s unique property called amphoterism (may react both as an acid or a base), aluminium hydroxide is capable to carry out many reactions undergone in industrial manufacturing, particularly as a feedstock or raw material of aluminium compounds manufacturing. Besides as a feedstock, aluminium hydroxide has fire retardant properties, thus is used as a fire retardant filler in many polymers. Aluminium hydroxide is also found in antacid as an active ingredient to relieve upset stomach by neutralizing stomach acidity mechanism. Tradeasia International as a global supplier of aluminium hydroxide provides you with aluminium hydroxide for your market solution. Get aluminium hydroxide in different grades, quantities, and packaging right now.

Manufacturing Process

In 1887, Carl Josef Bayer invented the Bayer Process. He discovered how to separate alumina from bauxite more efficiently. Firstly, bauxite is to be mixed with a hot solution of sodium hydroxide with temperature up to 270 degree celcius. The addition of sodium hydroxide solution causes the precipitation of alumina and the waste of bauxite tailings is removed. Alumina precipitate is then cooled and the resulting solution is calcinated and processed to give Al2O3.

The Uses of Aluminium Hydroxide

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Pharmaceutical

Pharmaceutical industry used aluminium hydroxide as an active ingredient of an antacid which may relieve acid indigestion, heartburn, and upset stomach.

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Water Treatment

Aluminium hydroxide is a common coagulant used in water treatment due to the ability of aluminium hydroxide to settle suspended solids, color removal, and remove phosphate from effluent.

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Plastic and Polymer

In the polymer industry, aluminium hydroxide is used as a filler for several polymers due to its property as a flame retardant.

Product Identification

  • Chemical Formula
  • Synonym
  • H.S. Code
  • CAS No.
  • Mol. Weight
  • Al(OH)3
  • Aluminium(III) Trihydroxide
  • 2818.30
  • 21645-51-2
  • 78.00 gram/mol

Physical and Chemical Properties

  • Appearance
  • Odor
  • Color
  • Melting Point
  • Specific Gravity
  • Solid. (crystalline powder.)
  • Odorless.
  • White. Off-white.
  • 300°C (572°F)
  • 2.42 (Water = 1)
  • 2.42 (Water = 1)